Licensed only is fine with me, since I have an S2 license..
it needs to come out though.. LFS Tune is fine for people who want to make cars go really fast, but those of us trying to recreate cars need the options of LFS Tweak.
It might sound dumb but LFS Tweak can be used to simulate how your car will react to some changes, gear ratios in my truck for example.. Not sure if it's accurate to simulate power changes, but there is enough there to help you get a better feel for changes than you would get from some text simulator.
the LFS people could make some money having a program like this, market it to performance builders as a simulator. hell, I'd drop $100+ right now on LFS with editable cars.